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Continuous Cropping Affects Gross Nitrogen Transformations in Subtropical Acidic Soils Under Greenhouse Cultivation
Journal of Soil Science and Plant Nutrition ( IF 3.4 ) Pub Date : 2020-03-26 , DOI: 10.1007/s42729-020-00231-z
Yongbo Xu , Jingjing Li , Xinhua Yin

Relationship between gross N transformation rate and continuous cropping years in the greenhouse soil is largely unknown. This study aimed to investigate the mechanism of the gross N transformation rate changes in greenhouse subtropical acidic soils under different continuous cropping years. The 15 N isotope tracer method was used to study the effects of greenhouse soil under 4 years of continuous cropping (C4), 5 years of continuous cropping (C5), and 7 years of continuous cropping (C7) of lily ( Lilium brownii ), respectively, on soil N transformation with the N tracer model. The results showed that the main soil N transformation processes were N mineralization, autotrophic nitrification, and NO 3 − -N immobilization under the three continuous cropping years. After continuous cropping, the gross N mineralization rate, autotrophic nitrification rate, and NO 3 − -N immobilization rate increased with the increase of continuous cropping years. Specifically, the gross N mineralization rate was 0.62~0.85 mg N kg −1 day −1 , the autotrophic nitrification rate was 1.08~3.24 mg N kg −1 day −1 , and the NO 3 − -N immobilization rate was 0.30~0.62 mg N kg −1 day −1 . Moreover, the positive difference between the autotrophic nitrification rate and immobilization rate of NO 3 − -N became greater with the increase of continuous cropping years, which might have been the main reason for the accumulation of NO 3 − -N in greenhouse subtropical soils. These findings contribute to the understanding of the mechanism of soil secondary salinization formation and provide ideas for prevention of secondary salinization under long-term continuous cropping.

中文翻译:

温室栽培下连作影响亚热带酸性土壤总氮素转化

温室土壤中总氮转化率与连作年限之间的关系在很大程度上是未知的。本研究旨在探讨不同连作年限下温室亚热带酸性土壤氮总转化率变化的机制。采用15 N同位素示踪法研究了百合(Lilium brownii)4年连作(C4)、5年连作(C5)、7年连作(C7)对温室土壤的影响,分别用 N 示踪模型对土壤 N 转化。结果表明,3个连作年间土壤氮的主要转化过程为氮矿化、自养硝化和NO 3 - -N固定化。连作后,总氮矿化率,自养硝化率和NO 3 - -N固定率随着连作年限的增加而增加。具体而言,总氮矿化率为0.62~0.85 mg N kg -1 day -1 ,自养硝化率为1.08~3.24 mg N kg -1 day -1 ,NO 3 - -N固定率为0.30~0.62 mg N kg -1 天 -1 。此外,随着连作年限的增加,自养硝化速率与NO 3 - -N 固定化速率的正差异变大,这可能是温室亚热带土壤中NO 3 - -N 积累的主要原因。这些发现有助于理解土壤次生盐渍化的形成机制,为长期连作下防止次生盐渍化提供思路。NO 3 - -N固定率随着连作年限的增加而增加。具体而言,总氮矿化率为0.62~0.85 mg N kg -1 day -1 ,自养硝化率为1.08~3.24 mg N kg -1 day -1 ,NO 3 - -N固定率为0.30~0.62 mg N kg -1 天 -1 。此外,随着连作年限的增加,自养硝化速率与NO 3 - -N 固定化速率的正差异变大,这可能是温室亚热带土壤中NO 3 - -N 积累的主要原因。这些发现有助于理解土壤次生盐渍化的形成机制,为长期连作下防止次生盐渍化提供思路。NO 3 - -N固定率随着连作年限的增加而增加。具体而言,总氮矿化率为0.62~0.85 mg N kg -1 day -1 ,自养硝化率为1.08~3.24 mg N kg -1 day -1 ,NO 3 - -N固定率为0.30~0.62 mg N kg -1 天 -1 。此外,随着连作年限的增加,自养硝化速率与NO 3 - -N 固定化速率的正差异变大,这可能是温室亚热带土壤中NO 3 - -N 积累的主要原因。这些发现有助于理解土壤次生盐渍化的形成机制,为长期连作下防止次生盐渍化提供思路。具体而言,总氮矿化率为0.62~0.85 mg N kg -1 day -1 ,自养硝化率为1.08~3.24 mg N kg -1 day -1 ,NO 3 - -N固定率为0.30~0.62 mg N kg -1 天 -1 。此外,随着连作年限的增加,自养硝化速率与NO 3 - -N 固定化速率的正差异变大,这可能是温室亚热带土壤中NO 3 - -N 积累的主要原因。这些发现有助于理解土壤次生盐渍化的形成机制,为长期连作下防止次生盐渍化提供思路。具体而言,总氮矿化率为0.62~0.85 mg N kg -1 day -1 ,自养硝化率为1.08~3.24 mg N kg -1 day -1 ,NO 3 - -N固定率为0.30~0.62 mg N kg -1 天 -1 。此外,随着连作年限的增加,自养硝化速率与NO 3 - -N 固定化速率的正差异变大,这可能是温室亚热带土壤中NO 3 - -N 积累的主要原因。这些发现有助于理解土壤次生盐渍化的形成机制,为长期连作下防止次生盐渍化提供思路。NO 3 - -N固定率为0.30~0.62 mg N kg -1 day -1 。此外,随着连作年限的增加,自养硝化速率与NO 3 - -N 固定化速率的正差异变大,这可能是温室亚热带土壤中NO 3 - -N 积累的主要原因。这些发现有助于理解土壤次生盐渍化的形成机制,为长期连作下防止次生盐渍化提供思路。NO 3 - -N固定率为0.30~0.62 mg N kg -1 day -1 。此外,随着连作年限的增加,自养硝化速率与NO 3 - -N 固定化速率的正差异变大,这可能是温室亚热带土壤中NO 3 - -N 积累的主要原因。这些发现有助于理解土壤次生盐渍化的形成机制,为长期连作下防止次生盐渍化提供思路。这可能是温室亚热带土壤中NO 3 - -N 积累的主要原因。这些发现有助于理解土壤次生盐渍化的形成机制,为长期连作下防止次生盐渍化提供思路。这可能是温室亚热带土壤中NO 3 - -N 积累的主要原因。这些发现有助于理解土壤次生盐渍化的形成机制,为长期连作下防止次生盐渍化提供思路。
更新日期:2020-03-26
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